Study of DIII-D tungsten erosion processes by using a carbon–tungsten mixed material model
Abstract
The tungsten erosion process for an H-mode discharge from the DIII-D Metal Rings Campaign is modeled using OEDGE and TRIM.SP. The OEDGE code is employed to calculate tungsten erosion between edge-localized modes (ELMs). Then a newly developed semi-analytical carbon–tungsten mixed material model based on TRIM.SP is used to simulate the intra-ELM tungsten gross erosion profiles. The tungsten erosion is found to be dominated by carbon, with different origin for carbon between ELMs and during ELMs. For inter-ELM, the tungsten is mainly eroded by locally redeposited low charge state carbon, while for intra-ELM, the C6+ originated from the pedestal region is found to dominate the tungsten erosion in the near separatrix region, whereas the locally redeposited low charge state C fluxes lead to a nonnegligible tungsten erosion in the outer SOL region. These results imply that modeling of W erosion during ELMs needs to include impurity transport from the pedestal to the divertor during an ELM. In addition, for both inter- and intra-ELM simulation, a carbon coverage of 30% on the tungsten surface is needed to reproduce the measured erosion at the divertor target.
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1488671
- Alternate Identifier(s):
- OSTI ID: 1530088
- Grant/Contract Number:
- FC02-04ER54698; AC05-00OR22725
- Resource Type:
- Published Article
- Journal Name:
- Nuclear Materials and Energy
- Additional Journal Information:
- Journal Name: Nuclear Materials and Energy Journal Volume: 18 Journal Issue: C; Journal ID: ISSN 2352-1791
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Plasma material interaction; Tungsten; Carbon; Erosion
Citation Formats
Xu, G. L., Guterl, J., Abrams, T., Wang, H. Q., Zhang, P. F., Elder, J. D., Unterberg, E. A., Thomas, D. M., Guo, H. Y., and Ye, M. Y. Study of DIII-D tungsten erosion processes by using a carbon–tungsten mixed material model. Netherlands: N. p., 2019.
Web. doi:10.1016/j.nme.2018.12.020.
Xu, G. L., Guterl, J., Abrams, T., Wang, H. Q., Zhang, P. F., Elder, J. D., Unterberg, E. A., Thomas, D. M., Guo, H. Y., & Ye, M. Y. Study of DIII-D tungsten erosion processes by using a carbon–tungsten mixed material model. Netherlands. https://doi.org/10.1016/j.nme.2018.12.020
Xu, G. L., Guterl, J., Abrams, T., Wang, H. Q., Zhang, P. F., Elder, J. D., Unterberg, E. A., Thomas, D. M., Guo, H. Y., and Ye, M. Y. Tue .
"Study of DIII-D tungsten erosion processes by using a carbon–tungsten mixed material model". Netherlands. https://doi.org/10.1016/j.nme.2018.12.020.
@article{osti_1488671,
title = {Study of DIII-D tungsten erosion processes by using a carbon–tungsten mixed material model},
author = {Xu, G. L. and Guterl, J. and Abrams, T. and Wang, H. Q. and Zhang, P. F. and Elder, J. D. and Unterberg, E. A. and Thomas, D. M. and Guo, H. Y. and Ye, M. Y.},
abstractNote = {The tungsten erosion process for an H-mode discharge from the DIII-D Metal Rings Campaign is modeled using OEDGE and TRIM.SP. The OEDGE code is employed to calculate tungsten erosion between edge-localized modes (ELMs). Then a newly developed semi-analytical carbon–tungsten mixed material model based on TRIM.SP is used to simulate the intra-ELM tungsten gross erosion profiles. The tungsten erosion is found to be dominated by carbon, with different origin for carbon between ELMs and during ELMs. For inter-ELM, the tungsten is mainly eroded by locally redeposited low charge state carbon, while for intra-ELM, the C6+ originated from the pedestal region is found to dominate the tungsten erosion in the near separatrix region, whereas the locally redeposited low charge state C fluxes lead to a nonnegligible tungsten erosion in the outer SOL region. These results imply that modeling of W erosion during ELMs needs to include impurity transport from the pedestal to the divertor during an ELM. In addition, for both inter- and intra-ELM simulation, a carbon coverage of 30% on the tungsten surface is needed to reproduce the measured erosion at the divertor target.},
doi = {10.1016/j.nme.2018.12.020},
journal = {Nuclear Materials and Energy},
number = C,
volume = 18,
place = {Netherlands},
year = {Tue Jan 01 00:00:00 EST 2019},
month = {Tue Jan 01 00:00:00 EST 2019}
}
https://doi.org/10.1016/j.nme.2018.12.020
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Figures / Tables:
Figure 1: The magnetic equilibrium of a type-I H-mode discharge in DIII-D, discharge 167,321, at 3000 ms, the cross section of the main chamber with the two tungsten rings in the lower divertor, and the key diagnostics used in the metal rings campaign. The insert shows a magnified version ofmore »
Works referencing / citing this record:
Impact of ELM control techniques on tungsten sputtering in the DIII-D divertor and extrapolations to ITER
journal, June 2019
- Abrams, T.; Unterberg, E. A.; Rudakov, D. L.
- Physics of Plasmas, Vol. 26, Issue 6
Modeling of inter- and intra-edge-localized mode tungsten erosion during DIII-D H-mode discharges
journal, October 2019
- Xu, G. L.; Guterl, J.; Abrams, T.
- Nuclear Fusion, Vol. 59, Issue 12
ERO modeling and analysis of tungsten erosion and migration from a toroidally symmetric source in the DIII-D divertor
journal, November 2019
- Guterl, J.; Abrams, T.; Johnson, C. A.
- Nuclear Fusion, Vol. 60, Issue 1
Figures / Tables found in this record: